Exam 3: Displaying and Summarizing Quantitative Data

Jody got a bank statement each month that listed the balance,in dollars,in her checking account.Here are the balances on several statements. Round your answer to the nearest cent.

The back-to-back dotplot shows the number of fatalities per year caused by tornadoes in a certain state for two periods: 1950-1974 and 1975-1999.Explain how you would summarize the centre and spread of each of the variables depicted in the dotplots.

The stem-and-leaf diagram shows the ages of 17 people at a playground in London,Ontario. Key: 3 | 3 = 33 years

Three statistics classes (50 students each)took the same test.Shown below are histograms of the scores for the classes.Use the histograms to answer the question. -For which class are the mean and median most different?

The stem-and-leaf display shows the results of a math test written by 30 students.

The employees at Frank's Furniture earned the following amounts,in dollars,last week. Round your answer to the nearest cent.

A weight-loss company used the following histogram to show the distribution of the number of pounds lost by clients during the year 2005.Comment on the display.

The precipitation,in millimetres,for August is given for 20 different Canadian cities.

The diastolic blood pressures,in mm Hg,for a sample of patients at a clinic are given.Create a stem-and-leaf display of the data.Use split stems.Let the lower leaf represent digits 0-4 and the upper leaf represent 5-9.

Heights of adult women attending a concert.

Heights of a group of male professional athletes,half of whom are gymnasts and half of whom are basketball players.

The test scores of 19 students are listed below.Find the upper quartile (Q3)by hand.

How would you describe the shape of each distribution?

Office workers were asked how long it took them to travel to work one morning.Here is the stem-and-leaf display. Would you use the median or the mean to describe the centre of this distribution?

Number of innings in the baseball games a major league team plays over the course of a season.

The histogram shows the lengths of hospital stays (in hours)for pregnant women admitted to hospitals in Ontario who were having contractions upon arrival.

The number of cars passing through a Tim Hortons "drive-thru" during each 15-minute period was recorded.The results are shown below.

In a college health course,65 students participated in a physical fitness assessment.One measure used in the assessment was body fat.The body fat percentages for the 65 students is given below.Create a histogram of the data using bins that are 2% wide.

Last year,nine employees of an electronics company retired.Their ages at retirement,in years,are listed below. Round your answer to the nearest tenth.

Here are the prices for 8 different CD players.Find the standard deviation.